BT stands for a bacterium Bacillus thuringensis . These bacteria secretes a toxic protein in crystals which kills the different pests .
The toxic crystals are in the form of protoxin .
These protoxins are inserted into the cotton plants by the process of recombinant DNA technology .
When the pests try eat the leaves of the cotton plants the protoxin is converted into the toxin as a result the toxin creates holes or pores in epithelial cells of the gut of the pests leading to the death of the pests .
The BT toxin are coded by a gene named cry .
Different cry cry IIAb toxins are used to kill the corn borer .
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